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High, CVSS 8.4amended

OpenClaude: Sandbox Bypass via Early-Exit Logic Flaw Allows Path Traversal

CVE-2026-35570GHSA-m6rx-7pvw-2f73

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (@gitlawb/openclaude 0.5.1), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
8.4 · CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
EPSS
  • CVE-2026-35570: 0.23% estimated exploitation activity in the next 30 days; percentile 14.17 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

A logic flaw exists in bashToolHasPermission() inside src/tools/BashTool/bashPermissions.ts. When the sandbox auto-allow feature is active and no explicit deny rule is configured, the function returns an allow result immediately — before the path constraint filter (checkPathConstraints) is ever evaluated. This allows commands containing path traversal sequences (e.g., ../../../../../etc/passwd) to bypass directory restrictions entirely. Affected Component - File: src/tools/BashTool/bashPermissions.ts - Function: bashToolHasPermission - Location: ~line 1445 (sandbox auto-allow block) Vulnerable Code Flow The sandbox block was designed to skip interactive permission prompts in sandboxed environments. However, it unintentionally also skips the path traversal filter, which is a separate and critical security control. Impact Any process or user operating in a sandboxed session with no explicit deny rules can: - Read arbitrary files outside the sandbox boundary (e.g., /etc/passwd,…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · amended ·

    Amended from ghsa record GHSA-m6rx-7pvw-2f73

  2. Revision 1 · created ·

    Published from osv record GHSA-m6rx-7pvw-2f73

Agent brief

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# Patch Next advisory brief: CVE-2026-35570

Advisory: OpenClaude: Sandbox Bypass via Early-Exit Logic Flaw Allows Path Traversal
IDs: CVE-2026-35570, GHSA-m6rx-7pvw-2f73
Record: https://patchnext.com/advisories/cve-2026-35570 (revision 2, source checked 26 Oct 2026, 12:48 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.4)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: @gitlawb/openclaude 0.5.1. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm @gitlawb/openclaude: affected < 0.5.1; fixed in 0.5.1

## Suggested inspection (read-only)
- `npm ls @gitlawb/openclaude --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on @gitlawb/openclaude.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-m6rx-7pvw-2f73 (OSV record GHSA-m6rx-7pvw-2f73 lists affected ranges: npm @gitlawb/openclaude >=0 <0.5.1 (fixed))
- Verified: https://github.com/advisories/GHSA-m6rx-7pvw-2f73 (GitHub-reviewed advisory GHSA-m6rx-7pvw-2f73 lists affected ranges: npm @gitlawb/openclaude >=0 <0.5.1)

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